Related Manuals for JCM GOLD GP965
Summary of Contents for JCM GOLD GP965
- Page 1 GP965 SLIP PRINTER SERVICE MANUAL JCM GOLD (H.K.) LTD. JULY, 98...
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Page 2: Table Of Contents
INDEX 1. OVERVIEW 2. GENERAL PRECAUTIONS 3. REPAIR BY UNIT REPLACEMENT Table 3-1 Main Units of GP-965 Table 3-2 Required Measuring Instruments Table 3-3 Surface Phenomena for Troubleshooting 3.1 The POWER switch is turned ON but the printer doesn’t operate 3.2 The printer operates but printing is abnormal 3.3 Paper feeding is abnormal 3.4 The control panel doesn’t work properly... -
Page 3: Overview
1. OVERVIEW Because of the variety of symptoms that may occur according to the site of the problem, troubleshooting can be quite difficult. To simplify entry into the actual repair procedures, however, this chapter groups them into the two categories below: (1) Repair by unit replacement (2) Repair of the units... - Page 4 Table 3-1 Main Units of GP-965 Name Unit No. Main Circuit Board Refer to the GP-965 Power Supply Board Refer to the GP-965 PS Panel SW Circuit Board Part Pricing List M-290 Printer Mechanism Table 3-2 Required Measuring Instruments Designation Standard Tester DC voltage and resistance...
- Page 5 3.1 The POWER switch is turned ON, but the printer doesn’t operate l CHECK POWER SUPPLY START Is the +24VDC output voltage normal? Check the contact of connector and AC switch Is the AC input voltage normal? Is the FUSE normal? Replace the FUSE Check the TOP224 regulator...
- Page 6 l CHECK MAIN CIRCUIT BOARD START Input +24VDC to CN1.Then POWER LED lights? Is the +5V voltage normal? Check the contact of all connectors Trouble remedied? Replace the main circuit board Trouble remedied? Replace the printer mechanism Trouble remedied? GP-965 service manual...
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Page 7: The Printer Operates But Printing Is Abnormal
3.2 The printer operates but printing is abnormal START Start the self test Is the printing faint or missing dots? Wipe the print head with alcohol Any printing is performed? Trouble remedied? Check the contact of connector CN5 Trouble remedied? Replace the main circuit board Trouble remedied? Replace the printer mechanism... - Page 8 GP-965 service manual...
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Page 9: Paper Feeding Is Abnormal
3.3 Paper feeding is abnormal START Are CN5 and the M- 290 connector in proper contact? Correct the contact Trouble remedied? Replace the main circuit board Trouble remedied? Replace the printer mechanism Trouble remedied? GP-965 service manual... -
Page 10: The Control Panel Doesn't Work Properly
3.4 The control panel doesn’t work properly START Connector CN3 contact is normal? Correct the contact Trouble remedied? Replace the panel SW circuit board Trouble remedied? Replace the main board GP-965 service manual... -
Page 11: Repair On The Unit Level
REPAIR ON THE UNIT LEVEL 4.1 Main Circuit Board Unit PHENO- DETAIL CAUSE CHECK REPAIR- MENON METHOD The printer Abnormal +5V power Faulty zener diode Check the +5V supply Replace ZD6, D1, doesn’t supply ZD6,diodes D1,D3, voltage in pin4 of U2 D3 and/or U2 operate at all and regulator... -
Page 12: Panel Sw Circuit Board Unit
The wrong Abnormal Faulty U4 Check the signals at Replace U4 characters driver/receiver in serial pin7~14 of U4 are printed port Abnormal Faulty U5 Check the signals at pin1~9 Replace U5 driver/receiver in of U5 parallel port 4.2 Panel SW Circuit Board Unit PHENOMENON DETAIL CAUSE...