Brand: PETRI
Category: Camera
Document Type:
Language: EN
Manual for 7S
Uploaded: Aug. 9, 2025, 11:59 p.m.
PETRI 7S Repair Manual - Operation Summary
This manual provides comprehensive guidance for the repair and adjustment of the PETRI 7S camera. Key operational areas covered include:
- Winding and Rewinding: Instructions for ensuring smooth film winding and proper rewind function.
- Shutter and Diaphragm: Detailed procedures for shutter speed adjustment, diaphragm operation, and troubleshooting common issues like blades not closing or oil contamination.
- Selftimer: Guidance on setting and operating the selftimer mechanism, including adjustment of gears and timing.
- Synchronization: Steps for checking and adjusting flash synchronization contacts (X and M) to ensure proper firing and timing.
- Meter: Troubleshooting for meter needle issues such as jumping, sticking, or incorrect readings, with steps for cleaning and adjustment.
- Counter: Procedures for the film counter, including advance and reset mechanisms.
- Range-finder: Instructions for adjusting focus for both near and far distances, ensuring sharp images.
- Final Inspection: A checklist for performing a thorough final inspection after repairs, covering all major camera functions.
Troubleshooting and error codes
| TROUBLE | CAUSE | REPAIR |
|---|---|---|
| WINDING | Impossible to wind |
1. Stopper (74) is deformed. Replace it. 2. Stopper (74) does not work well. Referring to 1-3 of SECTION II, adjust it. 3. Shutter set bar (78) does not work well. Referring to 1-5 of SECTION II, adjust it. 4. Stopper spring (79) is off. Correct the figure so that it may not come off. 5. Shutter set bar (78) is bent. Adjust the bend or replace it. 6. Wind gear pawl (70) is out of place. Referring to 1-1 of SECTION II, adjust the position right. 7. Shutter set bar (78) and Shutter set ring (132) are deformed because of the shutter being broken. Refer to SHUTTER "Shutter cannot be set" of SECTION I. |
| Wind lever does not return smoothly. |
1. Wind lever (57) is bent, hitting Slot cover base (52) or Body (110). Adjust the bend or replace it. 2. Lever return spring (55) is off. Adjust the tip of Lever return spring and fix it right. |
|
| Shutter cannot be re-leased unless Wind lever is wound twice. | 1. Drive pin screw (54) is loose. Referring to 1-2 of SECTION II, tighten it. | |
| Wind lever can be wound twice. |
1. Stopper spring (79) is off. Adjust the tip of Stopper spring. 2. Stopper (74) does not work well. i. If Stopper is deformed, replace it. ii. If Stopper hits Body (110), scrape the side of Stopper. |
|
| Film cannot be transported. |
1. Sprockets (41) race. i. Take out Drive shaft (44) and clean it. ii. When Rewind button does not work well, take it out and ream the hole of Bottom cover (2). |
|
| REWINDING | Heavy in rewinding film | 1. Rewind knob (3) does not work smoothly. i. Take out Rewind knob and put glove oil on Rewind shaft (50) and Spool bearing (48). |
| SHUTTER | Shutter cannot be set. |
1. Shutter set bar (78) and Shutter set ring (132) are bent. Adjust the bend or replace them. Note: The trouble is mainly due to the defect of shutter; as Cocking & drive lever (206) is inoperative, winding is done forcibly, resulting in the bend, so check the shutter. |
| Shutter cannot be released. |
2. Cocking lever (226) is slipped out of place because of looseness of Cocking lever screw (225). Get rid of looseness between Cocking & drive lever (206) and Cocking lever, and tighten Cocking lever. Use locking paint (synthetic resin). 3. Shutter release ring (130) does not work properly, so that it continues pushing Release bar (194). Smooth the surface of Shutter release ring or replace it. 4. Release arm does not work smoothly so that Shutter button does not return. Adjust it. 5. Release bar (194) does not return smoothly. Clean it. 6. Drive ring stopper (183) does not work smoothly. Adjust the parallel between Drive ring stopper and Gear base (182) so that Drive ring stopper may work smoothly. 7. Spring of Cocking & drive lever (206) is off. Adjust the figure of the spring or replace it. 8. Drive ring stopper (183) wears out, so that Shutter drive ring (220) cannot hook. Replace Drive ring stopper. |
1. Mechanism of MX fly wheel (184), MX delay action gear (185) and Sector gear (189) does not work well. Referring to 5 of SECTION II, take out each gear, wash, and put glove oil on. 2. Biting of MX fly wheel (184), MX delay action gear (185) and Sector gear (189) is not good. Referring to 5 of SECTION II, adjust the bend of each axis of Gear base (182) or replace it. 3. The sliding part of Drive ring stopper (183) and Shutter drive ring (220) does not move well. Polish the part with oil stone. Put MOS2 grease on it. 4. MX switch lever working wrong, M contact (199) hits MX delay action gear (185), so that mechanism of MX fly wheel (184), MX delay action gear and Sector gear (189) does not work. Adjust the figure of MX switch ring spring (213). 5. Selftimer gear stops halfway, so that Shutter drive ring (220) does not work. Wash Selftimer gear with mixed abluent (benzine 10 and glove oil-l). Do not put oil on the axis. 6. Slow speed escapement (207) does not work well. Wash it with benzine and put one drop of glove oil on the axis with an oiler. 7. Ankle of Slow speed escapement (207) does not bite the axis of Gear base (182). Referring to 2-1 of SECTION II, adjust it. 8. Shutter drive ring (220) does not work well. Adjust the balance of Shutter drive ring. 9. The pin of Shutter drive ring (220) is bent, hitting Selftimer lever. Bend the pin at right angles. |
| Shutter blades do not close. |
1. Slow speed escapement (207) does not work well. Refer to SHUTTER "Shutter cannot be released" of SECTION I. 2. Cocking & drive lever (206) does not slide Bulb lever (201) smoothly. Polish the side of Cocking & drive lever with oil stone and put MOS2 grease on it. 3. Bulb lever (201) does not slide the pin of Release bar (194) smoothly. Polish the side of Bulb lever and put MOS2 grease on it. 4. Oil sticks to Shutter blade (219). Take out Shutter case (211) and wash Shutter blade with benzine, and also clean the oil stuck to Mount base assembly (197), Diaphragm covering disc (217), and Shutter case (211). |
|
| DIAPHRAGM | Diaphragm blades do not work well. |
1. The pin of Diaphragm blade (216) is off. Take out Shutter case (211), Diaphragm covering disc (217), and Diaphragm disc (214) and replace Diaphragm blade. 2. Oil sticks to Diaphragm blade. Wash Diaphragm blade with benzine and clean the oil stuck to Shutter case (211), Diaphragm covering disc (217), and Diaphragm disc (214). 3. Set screw of Diaphragm drive ring (224) is loose. Tighten it and put locking paint (synthetic resin) on it. 4. Diaphragm drive ring is deformed. Adjust the balance of it. |
| SELFTIMER | Selftimer does not operate. |
1. Selftimer gear (180) does not come off the lever of Gear base (182). Referring to 3-1 of SECTION II, adjust it. 2. Selftimer gear (180) does not work well. Same as above 3. Ankle holding spring hits Selftimer spring (181). Same as above |
| SYNCHRONIZATION | Flash does not fire. |
1. Lead wire is off, or M or X contact does not work well. i. Solder the lead wire. ii. Clean X contact with benzine. iii. If X contact gets corrosive, replace it. |
| Flash does not synchronize. | 1. Contact time of X,M contact gets out of order. Refer to 6 of SECTION II. | |
| Flash blows out. |
1. Cover of lead wire peels off and insulation becomes ineffective. Replace the lead wire. 2. Synchro-plug does not insulate. Clean the plug or replace the plug and Insulation washer. 3. X,M contact do not insulate. When X,M contact touches the other part, refer to 6 of SECTION II, or replace Insulation washer. |
|
| METER | Meter needle jumps. |
1. Resistance inside ASA ring (164) gets dirty or its carbon strip is uneven. i. Clean dirty spots with dry cloth. ii. If the carbon strip wears out, replace Resistance. 2. Fixed brush w/insulator (160) or Moving brush (170) is deformed, so that it does not contact ASA ring (164) well. Adjust the figure of Fixed brush w/insulator or Moving brush so that its spring tention against ASA ring may be strong enough. 3. Connector (178) does not contact Connector ring (133) completely. Clean them and let them contact each other properly. |
| Meter needle sticks. |
1. Meter needle and Stopper (Insulator) get dirty. Clean Meter needle and Stopper with thinner or change the position where Stopper touches. 2. Pivot is too tight or loose. Adjust looseness to be 0.04±0.01. Note: Tighten the pivot and the moment before Meter needle stops it should be regarded as looseness being zero and loosen the pivot 60°. This is a proper looseness. |
|
| Meter needle is bent. | 1. Red celluloid needle is bent owing to temperature or humidity. Replace it with the present Meter which has phosphor bronze needle. | |
| Meter needle stops. |
1. Wire is cut inside Meter. Take out Meter and check the induction between Black lead wire and Meter cover by tester; when Meter shows ∞, replace Meter and in case of 0, pull out the wire as it short-circuits and put on vinyl tube for reuse. 2. Fixed brush w/insulator (160) contacts ASA ring. Correct the bend of Fixed brush w/insulator. 3. Connector ring (133) does not contact Connector (178). Same adjustment as METER: "Meter needle jumps." of SECTION I 4. The soldered part of Lead wire is off. Solder it again. |
|
| Meter is out of balance. |
1. Balance of weight moves out or comes off. Replace it. 2. Pivot is loose. Same adjustment as METER: "Meter needle jumps." of SECTION I |
|
| COUNTER | Counter does not advance. |
1. Advance pawl does not get in the first gear. Refer to 7 of SECTION II. 2. Momentum of advance pawl pin is small. Same as above 3. Advance pawl does not bite deep enough. Same as above 4. Counter ratchet spring (27) is off. Same as above 5. Counter pawl (24) does not bite deep enough. Same as above |
| Counter does not return. |
1. Counter shaft pin does not work well. Refer to 7 of SECTION II. 2. Counter shaft pin touches Body cover. Same as above 3. Counter gear spring is off or coils round. Same as above 4. Counter pawl (24) bites too deep. Same as above |
|
| RANGE-FINDER | is out of focus. |
1. Small mirror of Rangefinder frame (80) or Reflex mirror (93) is off. Clean the binding part and bind with mixed binding agent of Bond E2 and Cl (7:3). 2. Cam follower (85) does not work well. Take it out and clean it. 3. The angle of Small mirror is wrong. Referring to 8 of SECTION II, adjust it by collimator. |
| Near distance is out of focus. | 1. Same as above | Same as above |
| Vertical discord of moving image | 1. Same as above | Same as above |